2.2 Storage conditions and operating instructions

Humidity sensitivity level ( MSL ) is 1 , based on

IPC/JEDEC J-STD-020 standard. Therefore, it is

recommended to use it within one year after

shipment.

Humidity sensors are not ordinary electronic

components and require careful protection. This

must be taken seriously by users. Prolonged exposure

to high concentrations of chemical vapor will cause

the sensor reading to drift. It is recommended to

store the sensors ESD original package comprises a

sealed bag, and meet the following conditions:

Temperature range 1 0 ℃ -50 ℃ (0-85 deg.] C for a

limited time); humidity of 20-60% RH (no ESD

Package Sensor). For sensors that have been removed

from the original packaging, we recommend storing

them in the inner metal.

Anti-static bag made of PET/AL/CPE material.

Sensors should be avoided during production and

transportation

High concentrations of chemical solvents and

prolonged exposure.

Avoid contact with volatile glue, tape, stickers or

volatile packaging materials. Such as foam, foam and

so on. The production area should be well ventilated.

2.3 recovery processing

As described above, if the sensor is exposed to

extreme conditions or chemical vapors,

readings generated drift. It can be restored to the

calibration state by the following processing.

Drying: maintained at 80-85 ° C and <5% RHhumidity

for 10 hours;

Rehydration: 12 hours at 20-30 ° C and >75% RH

humidity.

2.4 temperature effects

The relative humidity of a gas depends to a large

extent on temperature. Therefore, when measuring

humidity, it should be ensured that all sensors

measuring the same humidity work at the same

temperature. When testing, ensure that the sensor

under test and the reference sensor are at the same

temperature and then compare the humidity readings.

If the sensor is on the same printed circuit board as the

heat-generating electronic components, measures

should be taken to minimize the effects of heat

transfer when designing the circuit.

In addition, when the measurement frequency is too high,

the sensor's own temperature will rise and affect the

measurement accuracy. If it is to ensure that its own

temperature rise is less than 0.1 ° C , the activation time

of AHT10 should not exceed the measurement

time. 10% - recommended every 2 seconds

measurement data once.

2.5 Materials for sealing and packaging

Many materials absorb moisture and act as a buffer, which

increases response time and hysteresis. Therefore, the

material around the sensor should be carefully selected. The

recommended materials are: metal, LCP, POM (Delrin),

PTFE (Teflon), PE, PEEK , PP, PB, PPS,

PSU, PVDF, PVF .

For sealing and

gluing (the conservative recommendation): recommended p

ackage, or an electronic component using a silicone

resinfilled epoxy. The gases released by these materials may

also contaminate AHT10 (see2.2). Therefore, the sensor

should be assembled last and placed in a well-ventilated

area or dried in an environment > 50 ° C for 24 hours to

allow the release of contaminated gases prior to packaging.

2.6 wiring rules and signal integrity

If the SCL and SDA signal lines are parallel and very close to

each other, it may cause signal crosstalk and communication

failure. The solution is to place VDD and / or GND between